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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '61f83ed5e9f6b5b2866f082c849fbcb7155817757c8b0208dae3b4193c8c55af' 
  AND token = 'EFAwYMazmAB6ZzAWR/5b8aASxdAl3Ta0Atylu1y3kWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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