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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '199c6320a9290b2020a23aaa2fa90da7fe725a7c0852f4b0820f8570cc982db9' 
  AND token = 'Nh2ASRLkYyyyGmSxneYCGTQIFw8bMYTlVfqzpYdJmhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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