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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '371e3814e416d0bab2c1315013813f5f27976c5fe30c2668b1155bf20e541335' 
  AND token = 'gobcNBquQ9OTigObqD0/JpLvPbtV0TeUPl/U15s/kqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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