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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f7ccd3791533bdfec5369d5c6c983e55f57fb6a6adff1f4ce66157c0ac31333' 
  AND token = 'oDK2cFL3mInL2SgriXWRBR7MZlG3EYMKsQjdut09hlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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