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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '094764c9dc38d5ed7197bda336d8c8a36563fb3a65496b6660c5e532032e771a' 
  AND token = 'vmmCc38mrShP7IwNv4tZU8vxGX6bzk+thSYCEaGC36M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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