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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '39b46942d7037e2d1150179bd71cb2e25592b8ad691c99998a2e0b2f5c4421a6' 
  AND token = 'yJQ54OyKfFoXO13nDraavfHdbAp5v4jQNyHZsnoVt2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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