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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e5c2d5d60600e16a1e0f8dc9b4830e8d80735eb7cfb38890349a3dad260b0e41' 
  AND token = 'TpsdzBcOFeNZfzFTr/KEJasCDl8eYhLf/EnoTmiYMJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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