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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '896ec5280049d6db95e9abcac909d1b6143da4923bb3acd1b20614d9a8d4263d' 
  AND token = 'VaWijH/YDXUODyDco/xV93LqTfw7Ea6J1AZUZLQc4ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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