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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c06a7c36965ee2f1b4104c9cfb9289791c2b2cc2df131c582270b6705806737' 
  AND token = 'xtEUTvjAv5ABT7X1UjPFplHF6cih/JT10lXrurwN/e8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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