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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '240e06ed62f38d1b4bd78980a83a04662a058137e0dbabfaabddd330b7490950' 
  AND token = 'lR6XKHNC0JBQNtJGyJtxDCLOjCNUuGV7hCGhq9nb6WQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}