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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aba1761cd756c6537e7f43801bac579bf2c00795da88561aeca3c75f628e3a1a' 
  AND token = '7NtO1DVH7OMZ9OkjKNsfSDJcdrXsymMFD/V2gSkhpoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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