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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f0c7a52ba67ec990d31344e1991bcf37186cac75cceef898d1b0004791962db8' 
  AND token = 'ML0BqMNMDZdF2tfiegtTqhL9MjjEMz1GO6PskPKSvJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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