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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3887fbd8c6c690e4bd2491a1ee7d14a7aa55ea94d0d559cba3bc475d2005feff' 
  AND token = 'b9H9ofMzdcaTNLAZpsQcuGP6PZn8QMYly5mONO8k0ZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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