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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e98a6d4014056fc04cb2b55abd869316633a3e78cda1eafadb6b17232ef205b' 
  AND token = 'abPiBvXH0sUi4v/ILMTyiNxfYcZn2NFNiuMfTu5uT84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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