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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '83cf1830fc228a1897b6c42a8ba5ef28e06a3225929f94042e63c980f30a5bba' 
  AND token = 'fryqA3EVPrJGtWgFvHdevlzs+kO+p7R7qtPNP4yj69s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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