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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b54ac0e643326881b21f471cdf995c849fc2c5d8d49ff0fe261ffe5c944093a' 
  AND token = 'yoMH+/KFy7MR1Rrlulw7KUaE0SObS/T21Agi3+csAC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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