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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d065f83442c9bd1af6ff3c43ae4df420b7ded8a4df8e39433a1870d3a399fa1' 
  AND token = 'yWDmxRDfOV/6XFXddy4k9dtYWw48rO62xg+xIC42kIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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