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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a06c2277e5cd627e3a1f9651c8cc23a9c3c82c4a3b2c443128d5f704da925cd' 
  AND token = 'rgNnrVHzMi6SZd0bcRw9DywGSfxYq6MuxH2Oi+Fs9Kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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