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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f0a5bb41cfa2a9b59697339f9fba78ea52e2ddc577bc71a11e958eff53b1c596' 
  AND token = '47nFbDZe6YNeploO/6R0ovkzvyih8ghSv0xAMxHufLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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