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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '803a67808034a2938bfadebd339d7b36ef8b4b3d096bf6cb6d80bdba1445057c' 
  AND token = 'FMuJ8wbysho6Qgy88OSKgsnw5e2m9mTUJQkJ0JKxE1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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