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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5aa66713204bc71f374e22e7d02199635469ffcd2e017513951cfd33b9a4977' 
  AND token = '47hAdZlaJbJPyuQutWyil6RAvTzr++feu6Y+9gOaa4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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