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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b30d13d77d0df9ac27d60be9e051c393c0efce8d8ef40b2d8a41244584adda9' 
  AND token = 'HmltEmDdK8Czfxqb8ldbB4/Iamvgtv6wyRboiBzMiDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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