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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b49dd7dac9a81f62d36ca33c2601c9380e99fb18b0b462509697210ac0813ae7' 
  AND token = '0mwKs410GQmFYAKZD15w8ZUws7TOWryo1JPb255H2Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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