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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a47d1ca69e8d8f1219f04d8e484d0a978eaa5c966240a2a2e9d3658cca090e2' 
  AND token = '/+lZgJA6dQGvec5aNDRu+ZL/o0ikdwOehRhxv2dv9Wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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