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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '561373a542d4295a8e38a8747f55eea6170d2a2462e28fa651aa4f7d1571343a' 
  AND token = 'dcK6zu+ZY3U15muvWQO6XJMIvXSw/7faL+WrcKR2fgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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