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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3fb1cb4a5acc78e206a1cc1b1772e11ff2f8173c673eb13a24f79a68a57374a9' 
  AND token = 'BhjY6pAkWe18chskNM4LZVA1YjJep5IZCR8dK8eyA/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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