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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41714a80da123e93ee5d3089d9c71dbc74c5a20a9d83984a4e65e05a85d5341c' 
  AND token = 'iGZ3WjpoRPI/hJAoKsiuNsDbThirtO6imnh8PB1y8Ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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