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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '569a84de5fcdd27da00de0eb80b061409b48ab3977d4d1f6aa4b728a024c0763' 
  AND token = 'w7rgvSZRbIN5v2eaecRK+Kxl4f/I8wEq/FtQBWY4eIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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