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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '317a772018bd73ca3b3e0d2d601d85ee1b365e82f094c1e71db2a988b2134b26' 
  AND token = 'z9JECFE7U6CUAvyaksJMw6py9BO+cLohUtlDw87O+c0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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