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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f2cf4d28ff44eb16f2e34f63d74ea909928397321cd94592f5b04812a8788a70' 
  AND token = 'sM6FogcAeIUQb3a2/iNWmf9bMCwcMgTbVFyaNKD6h38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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