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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc2aafc8cc82e4de25ea0d299163f6eb8ee5234cc6ccb12cb43f0bde838a78e5' 
  AND token = 'HLexB/1FOldW4Npn66BUHoVnp99VklhNXZi6m4zjyDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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