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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '987fa92bf06cd6a84e18b358a435db07d26702f57ac4086ebf3bde804f482e37' 
  AND token = 'Uy/N7KfXgUtd4b6JPweiDjjC86103VXgJl3CO6eqc6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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