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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a7b5b4b8024d1a3f707b4d05d325d5f11cee5236e9345db1ed472278e1584b0' 
  AND token = '3r104yKXFhO8qmnIxHtecu6eRbX3M2BRaQCgl3flJac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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