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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f9c51d9fc9b7c2dce3a3288fb71ac03077fde603f7d8bda8f6f0946c592143a' 
  AND token = 'aBoCnfdg3RzzexHyWsEEw2evelcBxCKe60Gs97s4FTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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