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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '39602e4bd4f6dde7c23136bcb616b0f1a02baca3e812fe5939bac7ef320119bc' 
  AND token = '86sJmd4qpFooKxk20+YNZ6rQdDiZavvjlb+xlO/T0Es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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