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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '06b3b72db706547d5bfe63e423b4b6f23f9e97e0d71a37955591756b2b6d4830' 
  AND token = 'FTaJ0gYb3pqKimRZKwKkuM47eYpq2gr81OainvLb9sM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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