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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a6a913b2a60d5e561b5e2c45f1c62df377aebafd2286d02713b59e10fcbd5e4d' 
  AND token = '+epMWzraLqatQJb3pPzmKVpsoa6ZK+2xLyDb2LUNtkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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