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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '73093ff02946f0fae905aa6448e64faf738c4a3668204ba72dfc717f8e802d20' 
  AND token = '4KfPQIaD6Wcn61iFXi2fDfEk4+vST5BYR1LIjhbiDtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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