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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b852f0126a12107ba9f94c74a001e30d5da7df8d7d8ba52f72370b14692fca82' 
  AND token = '7GK3d22zJnF6SBeL/OKKeE5ZbFCAlnp6JdCDjjS3nC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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