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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '35d66c96111b88b4126ecc394f5daba7c1bdcc4208b262c2c13898e5170b9acd' 
  AND token = 'FvR2IgcdnG5HM2OwMlHkvRvj2ASX+2RzjewHEJtUAg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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