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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '08d6407fa2cb68aafbe0b5a2c03d70c2fed8665562aafe5c650fa728beaf37f9' 
  AND token = 'ehypPlP7/zL0yo3V8+ZbunQ/BCtbox7NjX/8mfFRDjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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