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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91b8af9e055d090efdcd3c10d6a90fe08c1b0b8f8f2b8c898a4ce51163a22109' 
  AND token = 'V0Umq58qA8SQ9hSrL5k8OEl8+r97pVblGo2vfZVFra4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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