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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b31e604c5de5000f7b32171709a48ca7d00afc577ff6fce43e1d7e78ce4b13eb' 
  AND token = 'jxtm5irCIqVJ50P//aQ2T1zgmywcrml8pPvaqp0Eqtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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