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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '196aeb4d99d0474d6f0c597ee37e29c8f48bdebb7a4e582a69a8ca6408b94c76' 
  AND token = 'SegFye/G01mZ6YAWwPGiGmPEqMkRe1mbS4ABoHWVxe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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