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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7fc0715c52065be9239d82e6782605a79ca5f5c7828af1f4fea8dacb23acce74' 
  AND token = '0sZxYRNipsVVsY15vNY3tdQUbC+c4QZZPZjg9lAOfyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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