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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '48badcebde73ef0ef89fe71f5547a2643c4d2e0fbb89be0c256e5ba35fc4272d' 
  AND token = 'z3nmoQKKe5D8WOyl+BeGOnS77dzJNrI21ME30VLfVJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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