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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa9380fd48329c71a8c28d29b101ce139769127503dc3220084eda9f8d5bc072' 
  AND token = 'pZRUT2a3WntM3kAdIiKquhaa28s8s1rRye8fUB9lFmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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