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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3c6e900196fa4b817186fca940795614d0979c2a5a1f83110d8e868d371b34f0' 
  AND token = 'yNZcl/3EqCPs4TbITKU9+rySQdimnm1/xA12GIXgkno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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