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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3df71894a6f2d3d2abaf95984b13da3436f724f41c71c465a04f15663ee6f3bd' 
  AND token = 'h18PzjRUi0hyX9WJBjtI+yaVf7Is1l1h3Wx10aiIKWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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