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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c7aa42bf296af3c3ff01be52c39265c5cdae0beb95e0165907b9f5a52ce310a6' 
  AND token = 'DAzusuvYDvrtkwybxdlFY4N6u8X1pCSoclTFdcm10cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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