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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e53135b4a7c754e233a6ed9d137e0a43b5d8db51afdfe7a17937a1a1e3761b5' 
  AND token = 'ZGrWDfUZ0Mi3YMCZlAThZTLGsqKyhcR9IPyW3vyaE/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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