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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f925379ef0e6bfde42c78c507a693bda3ee2afd9db847bdae72f8ea9d24cb4f9' 
  AND token = 'dXFz23+5SjgBouFAftGdXvn0H6PPtD+brXUEnLm6b6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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