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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b7e9411b6c392867966a2d75426a287c3f528a05a8c107c2e04f0242d33bd71' 
  AND token = 'LDLjmNsLFqHPUa4FNeTFW5DG0vSGzHEY37kuOThe6TY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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