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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b731850566ab9d95b862fcdea55be67371004f4773165d5d0a9fd11e1a00fe1' 
  AND token = 'zwInz3bapVazIqrwZKLl+qC8T1tUo7qvoEYUPToY8YE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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