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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '439b7f1cdff0e1a4762ab79030e9fa8c5ead2a52314e7ee3ecaee66a4cadf189' 
  AND token = 'hkbxXscRD7VYVAZ5g9HOY9FovJ+kHmikxFa+pz6CWeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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