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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3411bf32820252baf04f34eb2810864ef680e079e913349e3ea30590881d1177' 
  AND token = 'xxuReP5kA5fv7H9UOlH/w8w0BnHWOsfFQ5z4F720+YU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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