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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae9d31bfceaac9fa18c2438d53d915be69fb4fb194020a8c80b0d9b919b9426d' 
  AND token = 'SS03DbtMBfitrQu/V5hkmBFGF4dy9MhOiZoklYDfANk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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